Flame extinction and burning behaviour of timber under varied oxygen concentrations

Self-extinction plays a crucial role in enabling the safe use of timber structures mid- and high-rise construction, where structural integrity during after fire is critical. To date, influence that oxygen concentration may have conditions lead to self-extinction has not been studied depth. Also, thermal occurred carefully studied. During fires, concentrations will defer from those ambient conditions. Within this study, testing were controlled investigate circumstances before occurrence self-extinction; considering range heat exposures air surrounding test sample. For samples tested containing 21% oxygen, always occurs for an incident flux 30 kW/m2 but never 40 kW/m2; with critical mass loss rate leads being 3.6 ± 0.4 g/m2s. The study concluded lower result increase leading minimum self-extinction.